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Finding the Fourth Proportional to 124,867.78, 172,170.30 and 100,920.40

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Solution

The fourth proportional to 124,867.78, 172,170.30 and 100,920.40 is: 139,151.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    124,867.78 : 172,170.30 = 100,920.40 : x
  2. Step 2: Convert to fraction form
    124,867.78/172,170.30 = 100,920.40/x
  3. Step 3: Cross multiply
    124,867.78x = 172,170.30 × 100,920.40
  4. Step 4: Simplify right side
    124,867.78x = 17,375,495,544.12
  5. Step 5: Solve for x
    x = 17,375,495,544.12/124,867.78
  6. Step 6: Final answer
    x = 139,151.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.